10
11
Several basic concepts are given below regarding the
preparation of traditional mixes that may be conveyed with
POLI T:
• the aggregates must be within the granulometry
curve:
for example, use aggregates that have
particle size: 1/3 between 0 and 1 mm inclusive
1/3 between 1 and 3 mm inclusive
1/3 between 3 and 5 mm inclusive.
• for a batch of 140 litres, 50 kg (one bag) of
cement or plasticized lime are normally used.
• the water/cement ratio should be approx. 0.6:
i.e. 25 - 35 litres of water for a batch of 140 litres,
depending on the quantity of cement and the
moisture content of the aggregates.
• when using ready-mix mortars (mortars with
controlled shrinkage, normal or light cement-
based ready mixes), the instructions provided
by the producer of the material must be carefully
followed, in particular with regard to the quantity
of water and the mixing time.
POLI T basically consists of a hopper with built-in agitator,
which receives the mixed material, and a screw pump for
pumping the material. It may be fitted with a pan mixe
r
(/MP version)
for preparing the mix.
The mix is unloaded into the hopper then pumped by
the screw pump to the place of application; the material
is conveyed through a hose to the spray gun (which may
differ according to the types of materials used), where air
coming from the auxiliary compressor is introduced to
propel the mix.
Pump output may be adjusted by means of a regulating
handwheel
(13)
.
The output should only be adjusted with the motor
running, otherwise the variable-speed drive could
be broken.
The nozzleman starts and stops
the machine by opening and closing
the air control valve
(14)
located on the gun,
or through a remote control
via cable
(15)
.
A water gauge may be installed for batching the water
and a vibrating sieve for sieving the material.
4.1 – OPERATING PRINCIPLE
4 - USING THE MACHINE
4.2 - PUMPABLE MATERIALS
13
14
15
Summary of Contents for POLI T
Page 31: ...31 ...
